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H. VANE AND N. BRITTON PORTABLE STAIR ROUTER.

' APPLICATION FILED FEB; n. 1916.

1,318,622. Patented Oct. 14,1919.

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PORTABLE STAJR ROUTER.

APPLICATION r1120 FEB. 11. 1916. r

1,318,622. Patented 001. 14,1919.

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PORTABLE srAm-n'ovrnn.

To all whom it may concern."

'Be it known that we, HARRY VANE and NORMAN BRITTON, citizens of United States, residing 'at' Cincinnati, in. thecounty of Hamilton, and State of Ohio, have invented certain new and useful Improvements in Portable Stair-Routers; and we :do hereby declare the following to be a run, clear, and exact description of the "invention, suchas I router. I

' ofthis character equipped with means for v will enable othersskilled in the art to which it appertains to make and use the same.

The invention mates to a portable staii? .Thefobject of the 'presentinvention is to pr vide} l simple, ractical and rompara; tivelyv inexpensive stairrouting machine adapted; to be rea'dily ielamped, to a stair stringer or other piece of timber and capable ofaccurately; groovi1'1gthesame across the grain for provldlng grooves in stringers for steps and; risers and variousother purposes. A 'fui'therobject, of the invention 1s to provide a portable stair routing '-mach1ne automatically feeding, a-cutter and; for also automatically stopping the feed of the machine. at a predetermlned point so that a plurality of similar grooves may be'cut with H accuracy.

With these ans; objects a s-wee invention consists in the; constructlon, and novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings and pointed out in the claims hereto appended, it being understood that various changes in the form, proportion and minor details of. constru tion may be resorted to ,Without departing from the spirit or sacrificing any ofjthe advantages of the invention. '1 Q In the drawings 1 o 1 Figure leis a'front elevation of a portable stair router constructed in accordance with this invention,

Fig. 2" is an end elevation'of the same, "Fig. 3 is. a rear elevation, of-thejst'air routing machine, ,f 7

Fig. 4 is av lan view of the same, Fig.5 isan enlarged horizontal sectional view of a portion of the machine, illustrat ing theconstru'ction ofthe feed mechanism andithe automatic .stop,

. Fig. s ald'etail perspective am -eff the automatic stop,

Specifieation'of Letters Patent.

. Like numerals ofreference designate cor respond ng parts n the vseveral figures 0f" the drawings.

Patented'0ct.1;4e,1919. Applicationfiled February 11,1916. Serial No. 77,717.

In the accompanying drawings in which is illustrated the preferred embodiment of the lnvention, the portable stair routing ma chine comprises in its construction ahed' plate 1 provided at opposite sides with grooves 2 for the reception. of a base 3 of a supporting frame 4: slidable longitudi nally of thebed plate and interlocked with the side grooves of the same, The sid grooves are preferably formed by vertical and inwardly extending flanges as clearly illustratedin Fig. 2 of thedrawingso j i-The bed plate -;is provided at its end por- I ,tions w th longitudinal slots 5 having; en

larged inner'en'ds 6 to admit the heads of screws 7 ofclampsS of. approximately -L shape which are adaptedto engage the stringer of steps for securing the routing machine thereto. The clamps are adjustable along} the; slot to arrange them ;in' proper positio timber. p

j The supporting frame 4; is preferably in the form' ofa "vertical standard provided with upper and lower forwardly projecting n for engaging a stringer or other 1 hearing arms "10 and 11 in iwhich is mounted avertical {cutter shaft 12 having a threaded lower p'ortion-13-for the reception of a cutter 14 consisting of spaced blades and aconne-cting'head or portion and provided with a threaded; opening to receive the threaded portion of th'Qcutter shaft. The cutter whichgis adapted to he arrangedat different elevations to varythe depth ofthe grooves is spaced from the shoulder 15 by oneormore washers'16 and is preferably clamped in its adjustmentby set screws 17 Cutters of various sizes and stylesmay ofcourse be employed and the width "of the grooves may be varied by, varying the sizeof the cut ten 'The cuttershaft'ise uippedat itsupper end withabalance or y wheel 18 and it is. held; against vertic'alrmovement in the bearing ams by an upper set collar 19 and at. its lower' endt a bevel pinion having set s e 2 are be e pi on ZO Wh is horizontally disposed meshes with a vertically disposed bevel gear wheel 22 mounted on a stub shaft 23 and provided with a pinion 24 which meshes with a pinion 25 that is also mounted on a suitable stub shaft. The upper pinion 25 meshes with a spur gear Wheel 26 disposed vertically in the plane of the said pinions 2 k and 25 and mounted on the front end of a horizontal operating shaft 27, journaled in suitable bearings of the supporting frame and extending rearwardly therefrom and equipped with a crank handle 28 by means of which the portable stair router is operated, but any other suitable operating device may of course be employed. The train of gears for transmitting motion from the operating shaft to the cutter shaft may be of any desired size to'secure the desired speed of the cutter shaft.

The operating shaft is also provided with a worm 29 which meshes with a horizontal worm wheel 30 of a vertical shaft 31 journaled in suitable bearings in arms 32 of a bracket 33 which is secured to the rear side of the standard, but any other suitable supporting means for the vertical shaft of the feeding mechanism may of course be employed. The vertical shaft 31 constitutes a pivot for a horizontally disposed lever 34: extending longitudinally of the machine in the direction of the. cut and carrying a plurality of gears 35, 36, 37 which mesh with one another. The inner gear 35' is mounted on the vertical shaft 31and it is keyed or otherwise secured to the same and it meshes with the intermediate gear 36 which is mounted on a vertical shaft or pivot 38 carried by the lever. The outer pinion 37 meshes with a longitudinalrack bar 39 located above the plane of'the bed plate and supported by arms 40 extending upwardly from the bed plate at the rear side thereof.

' The lever is adapted to swing toward and from the rack bar and it is urged toward the rack bar by aspring 41 consisting of a pair of arms and a connecting coil 42 which is arranged on the vertical shaft 31. One of the arms of the spring bears against the standard and the other engagesa rod'or member 43 extending upwardly from the pivot 44: of the outer gear 37 and adapted to form a convenient handle or grip for.

' swinging the lever away from the rack bar to permit the supporting frame to be moved along the bed plate in returning the mechanism for another cutting operation. The gear is automatically moved out of engagement with the rack bar to stop the feeding of the machine by a stop 4L5 consisting ,of a yoke straddling the rack barand having a clamping screw 4 6. The. inner side of the yoke is beveled at 47 and the terminal 48 ofthc lever is slightly curved and it presents a rounded face to the automatic stop to enable. the-lever to slide overi'the bevel portion of the stop and swing the said gear wheel out of engagement with the rack bar. The automatic stop is adapted to be set at difi'erent points along the rack bar and it is equipped with a gage consisting of a hor1- zontally disposed rod d9 carrying a block 50 in'whi'ch a vertically disposed rod 51 is mounted. The block is equipped with set screws 52 .and 53 for engaging the horizontal and vertically disposed rods and it has bores or openings 55 and 56 adjustably receiving the said rods. The block is adapted to slide inwardly and outwardly on the horizontally disposed rod and the vertlcally disposed rod is movable upwardly and downwardly and it may be arranged at different angles or inclinations as will be readily apparent. The bed plate is also provided with spaced line gages 56 of approximately L-shape adjustably secured in bores or openings 57 by set screws 58. The line gages coact with engaging lines previously made on a stringer or timber to enable the machine to be properly positioned on a stringer or timber and the stop will enable the feeding of the machine to be stopped at the desired point. While the machine is designed particularly for routing grooves for steps and risers where the grooves do not extend' entirely across the timber it-may of course be advantageously employed for analogous operations andwill cut entirely across a timber within its capacity or terminate the groove at any desired point between the side edges of the timber.

H What is claimed is e V; o 1. A portable routing machine, including a bed, a standard slidably mounted on the. bed, a cutter shaft carried by the standard,

an operating shaft carried by thestandard v.

and having connection with said cutter shaft, a feed shaft carried byrthe standard and, having connection with said operatingshaft, a rack bar carried by the bed, a lever pivoted: to :said shaft, a train of gears mounted on said lever and havingcconnection with said rack bar, one of said gears being keyed to said feed shaft, and a. stop mounted on said rack bar .and adapted for disengaging said train ,of-gears with said saidqoperating;

being keyed to said feed shaft, a stop In testimony whereof We aflix our signamounted on said rackbar and adapted for 'tures in presence of two witnesses. disengaging said train of gears With said HARRY VANE rac: bar, and a coil spring having arms en- 1 gaging said standard and the shaft of one NORMAN BRITTON' of sald gears for normally retaining said' Witnesses:

train of gears in engagement with said rack JOHN DONISEIFER,

bar. r A. I. MURDOCK.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of I'atents, Washington, D. 0. 

